Why does a “KLH fusion L” and “KLH fusion R” both show up in my devices on my phone?

The left & right earbud can each be connected to your devices Bluetooth, and both will show up in the Bluetooth device list. However, during the pairing procedure, your device will give priority to one earbud and ask permission to connect to the other. Once you give it permission to connect to the other earbud, it is only necessary to re-connect to one device in the future. The earbud with priority will be the first one listed in the device list.